The Rise of the British Jihad

MI5 says that some 4000 British Muslim extremists are a threat to national security and that another major terrorist attack is not a question of 'if' but 'when'. The investigative journalist Richard Watson, who has been at the forefront of reporting terrorism and extremism for BBC Newsnight, presents the results of his major investigation into the rise of extremism in Britain, which has just been published by Granta.